Write a chemical equation representing the second ionization energy for lithium.

  Ionization means pulling off an electron. So the first IE means removing 1 electron from lithium: 
Li --> Li+ + 1 e- 

The product is a + ion because it now has one more proton than electron. 

The 2nd ionization energy is removing a 2nd electron from that resulting cation: 
Li+ --> Li2+ + 1e- 

Ibelieve y y even though i've only taken chemistry for one year